Crack Art: Difference between revisions
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(file format) |
(uncompressed image data format) |
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| Line 19: | Line 19: | ||
uint8_t data[] | uint8_t data[] | ||
} crackart_file; | } crackart_file; | ||
If the file is uncompressed, sizeof(data) == 32000 bytes of raw video memory. | |||
==Decompression algorithm== | ==Decompression algorithm== | ||
==Uncompressed data format== | ==Uncompressed data format== | ||
The image data is stored in a planar format. | |||
[[Image:Atarist_lowres.png]] | |||
[[Category:Image Formats]] | [[Category:Image Formats]] | ||
</span> | </span> | ||
Revision as of 16:33, 1 May 2008
- Company: Detlef Röttger & Jan Borchers
- Extensions: .ca1, .ca2, .ca3
Crack Art was an image drawing program for the Atari ST. Here are the m68k assembly compression and decompression routines, provided by the original program.
16-bit words are stored in big-endian order.
File format
typedef crackart_file {
uint16_t magic; /* "CA" */
uint8_t compressed; /* 0 = no compression, 1 = compressed */
uint8_t resolution; /* 0 = low (320x200x16), 1 = medium (640x200x4), 2 = high (640x400x2) */
uint16_t palette[palsize]; /* palsize = 16 (low res), 4 (med res) or 0 (high res) */
uint8_t data[]
} crackart_file;
If the file is uncompressed, sizeof(data) == 32000 bytes of raw video memory.
Decompression algorithm
Uncompressed data format
The image data is stored in a planar format.
